The definition of IB varies in different regions. According to Dr. Albert So, who has developed a definition of IB for Asia, an intelligent building is designed and constructed based on an appropriate selection of quality environment modules to meet users’ requirements by matching the appropriate building facilities to achieve long-termed building value. The definition includes two dimensions -- the needs of the building developer/owner/occupants and the enabling technologies. The integration of these two dimensions will generate measurable long-termed building values such as productivity, market value, energy conservation, environmental friendliness and high working efficiency. (Source: So A.T.P., Wong A.C.W. and Wong K.C., “A new definition of intelligent buildings for Asia”, Facilities, Vol.17, No.12/13, 1999, pp.485-491)